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Customer Case Study 
 
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. 
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Solution 
As part of the government proposal process, Universitätsklinikum Essen tested five wireless 
solutions, requiring each vendor to build a demo pilot. Based on a centralized WLAN infrastructure 
that used two controllers and up to 15 access points, the individual pilots tested the security, 
management, and flexibility of each solution. Cisco deployed a pilot of its Unified Wireless Network 
in the hospital’s radiology department. “All features of the Cisco Unified Wireless Network, 
especially the security capabilities, integrated perfectly with our existing Cisco infrastructure,” says 
Ressing. “Besides providing the right capabilities, we liked the advantage of working with one 
proven vendor, which would save us additional time and money.”  
Once Universitätsklinikum Essen selected the Cisco
®
 Unified Wireless Network, Ressing began 
discussing the possibility of using 802.11n technology. Even though the technology was not on the 
market yet, Ressing was convinced that adopting 802.11n as soon as it was available would 
protect the investment of the hospital in the future. “Cisco shared its roadmap with us, designed an 
802.11 a/b/g network that we presented to the government for funding, and committed to changing 
our access points to 802.11n as soon as they became available,” says Ressing. “Cisco was a true 
partner.”  
After receiving government funding in 2008, Universitätsklinikum Essen began deploying the 
802.11n network. Today, the network is nearly fully deployed in the main hospital buildings, giving 
doctors, staff, and students mobile Internet and network access. To incorporate mobility into its 
clinical processes, Universitätsklinikum Essen began with one building as its test bed.  
The introduction of the first mobile ward in the hospital caused positive changes in traditional 
clinical process workflow. Using laptops, tablet PCs, and PDAs, doctors and nurses now record 
and access data directly at the patient bedside, saving time and increasing accuracy. Healthcare 
givers also use PC carts to review lab results and radiology film right from their patients’ rooms. 
“The 802.11n network supports all a, b, and g clients, making our transition to mobile patient care 
smooth and easy,” says Ressing. 
Universitätsklinikum Essen also uses Cisco’s Unified Wireless Network in conjunction with its 
Drager and Phillips patient monitoring systems. Through the Cisco Compatible Extensions 
Program, both vendors’ systems are certified with Cisco, helping to ensure transparent 
interoperability and reliability between the mobile equipment and network. “Thanks to the Cisco 
Unified Wireless Network, our doctors and nurses can now continue to monitor breathing and heart 
rates if we need to move patients between rooms,” says Ressing. “The mobile monitors transmit 
this vital data to our caregivers via the wireless network in real-time.”  
The advanced security features of the Cisco Unified Wireless Network are critical for 
Universitätsklinikum Essen. “We’ve created 120 VLANs within the network, keeping each 
department, clinic, and user group within the hospital separate,” says Ressing. When a user logs 
in, the network authenticates against the RADIUS server based on pre-defined user group policies. 
“Each user is automatically brought in to the correct VLAN,” he says. “This also makes it easy for 
us to provide secure guest access to patients and visitors.” 
Results 
The Cisco Unified Wireless Network is helping Universitätsklinikum Essen to improve efficiencies in 
its clinical processes, increasing caregiver productivity and patient care. “Cisco enables us to 
introduce completely new workflow processes that focus around the patient,” says Ressing. In the 
past, doctors handwrote their notes at the patient bedside and later entered the information into a